Step Thru & 1/4 In (turn 1/4 in place toward the center of the 4-dancer formation);

Right Pull By.

Ends in Back-to-Back Couples.

From a Right-Hand Wave:

beforeExplode The Wave

afterStep Thru & 1/4 In

afterRight Pull By

(done)

From a Left-Hand Wave:

beforeExplode The Wave

afterStep Thru & 1/4 In

afterRight Pull By

(done)

From an Inverted Line:

beforeExplode The Wave

afterStep Thru & 1/4 In

afterRight Pull By

(done)

Notes:

The Right Pull By is done with the person originally
facing the same direction as you were. In this respect, Explode
The Wave is similar to
Trade The Wave in that you can
'peek' down the wave to determine with whom to work.

1/4 In | Out[A1](Jim Faulkenberry and Clarence Watson 1959):
From a Couple or Mini-Wave.
Individually turn 1/4 toward (1/4 In) or away from (1/4 Out) your Partner
(the adjacent dancer). If you do not have a Partner, turn 1/4 toward or
away from the center of the smallest applicable sub-formation you can find.